Is CVE-2017-7901 actively exploited?

No active exploitation of CVE-2017-7901 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-7901 be exploited remotely?

Yes. CVE-2017-7901 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-7901?

CVE-2017-7901 has a CVSS score of 8.6 (HIGH).

HOME VULNERABILITIESCVE-2017-7901

HIGH

CVE-2017-7901

CWE-343Published: June 30, 2017· Updated: Jun 17, 2026

8.6

CVSS v3.1

Official Description

A Predictable Value Range from Previous Values issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions; 1763-L16BWA, Series A and B, Version 16.00 and prior versions; and 1763-L16DWD, Series A and B, Version 16.00 and prior versions and Allen-Bradley MicroLogix 1400 programmable logic controllers 1766-L32AWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWAA, Series A and B, Version 16.00 and prior versions; 1766-L32BXB, Series A and B, Version 16.00 and prior versions; 1766-L32BXBA, Series A and B, Version 16.00 and prior versions; and 1766-L32AWAA, Series A and B, Version 16.00 and prior versions. Insufficiently random TCP initial sequence numbers are generated, which may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections, resulting in a denial of service for the target device.

NVD Source

Technical Analysis

CVE-2017-7901 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.6.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected Vendors & Products

rockwellautomation21 product(s)

1763-l16awa series a1763-l16awa series b1763-l16bbb series a1763-l16bbb series b1763-l16bwa series a1763-l16bwa series b1763-l16dwd series a1763-l16dwd series bab micrologix controller1766-l32awa series a1766-l32awa series b1766-l32awaa series a+9

Source: NVD CPE · 22 total CPE entries